An advertising campaign is a series of linked advertisements with a similar theme. The Blair Witch Project used a highly successful viral marketing campaign, creating a website that documented the supposed true story and legend, adding to it over months to increase intrigue. This included posting missing person's flyers and interviews to make the story seem real. The limited 27 screen release also created high demand. Ultimately, the campaign was so effective because it generated real uncertainty over whether the story was factual or fictional.